Abstract:

Objective To investigate the comparability of serum potassium（K⁺）,serum sodium（Na⁺）,glucose（Glu） and total carbon dioxide（TCO₂） determined by GEM Premier 3000 blood gas analyzer （Premier 3000） and Hitachi 7600 biochemical analyzer （Hitachi 7600） and hemoglobin（Hb）and hematocrit（Hct） determined by Premier 3000 and Sysmex XN-1000 hematology analyzer （XN-1000）,and to investigate the influence of respiratory index（RI） on the above results. Methods K⁺,Na⁺,Glu,TCO₂,Hb,Hct and RI of arterial and venous blood in 193 patients were determined by Premier 3000,K⁺,Na⁺,Glu and TCO₂ of arterial and venous plasma were determined by Hitachi 7600,and Hb and Hct of venous blood were determined by XN-1000. The differences of same test items in different analyzers and specimen types were analyzed. According to RI,193 patients were classified into 3 groups,Ⅰ group（30 cases,RI<0）,Ⅱ group （45 cases,0≤RI≤1） and Ⅲ group（118 cases,RI>1）,and the differences of above indices were compared among different groups. Results The differences of K⁺,Na⁺ and TCO₂ between arterial blood by Premier 3000 and arterial plasma by Hitachi 7600 were statistically significant（P<0.05）,but there was no statistical significance for Glu（P>0.05）. With arterial plasma data by Hitachi 7600 as dependent variable（Y） and arterial blood data by Premier 3000 as independent variable（X）,the correlation analysis and linear regression analysis were performed,and the regression equations of K⁺,Na⁺,Glu and TCO₂ were Y=0.868X+0.561（r=0.959）,Y=0.993X+5.998（r=0.831）,Y=1.080X+0.594（r=0.992） and Y=0.857X+0.755（r=0.956）,respectively. The differences of K⁺,Glu and TCO₂ by Hitachi 7600 between arterial plasma and venous plasma were statistically significant（P<0.05）,but there was no statistical significance for Na⁺ （P>0.05）. The results of K⁺,Na⁺ and Hb in arterial blood by Premier 3000 were lower than those in venous plasma by Hitachi 7600 and in venous blood by XN-1000（P<0.05）,but there was no statistical significance for Glu,TCO₂ and Hct（P>0.05）. There was statistical significance for K⁺（P<0.05）,with no statistical significance for Na⁺,Glu,TCO₂,Hb and Hct（P>0.05）by Premier 3000 in arterial blood by RI. Conclusions Glu,TCO₂ and Hct in arterial blood can be used for evaluating Glu level,respiratory function and clinical transfusion,and K⁺,Na⁺ and Hb in arterial blood only have reference significance.

Key words: Blood gas analyzer, Electrolyte, Glucose, Hematocrit, Respiratory index